As a green self-reinforcing polymer material

natural rubber has the advantage that synthetic rubber can't match. There have been a lot of literature reports on strain-induced crystallization of natural rubber

but there are few reports on the research of low-temperature crystallization of natural rubber. The research on low-temperature crystallization of natural rubber has theoretical guiding significance for the production of low-temperature resistant natural rubber products. In this paper

the low temperature crystallinity and grain size of natural rubber were studied by differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD). The results show that there are two kinds of crystals when natural rubber is crystallized at low temperature. The crystallinity increases with the crystallization time

and it crystallizes completely at about 5 h. The crystallinity and grain size of natural rubber do not change. It indicates that the increase in the crystallinity of low-temperature crystallinity of natural rubber is derived from the increase in grain size rather than the increase in the number of grains.